Malicious PDF — malware analysis report

Static analysis result for SHA-256 d412e84ead3b088f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 04:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2310c46464879b279859b646e4b125a SHA-1: 04dbfec910e18d5aef330e79eaaff0bab7cea90a SHA-256: d412e84ead3b088f94715c867c1ad38aface5ddf55fcf91cda394b862bab4b58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text related to 'combining like terms with negative coefficients worksheet' and the URL https://ttraff.ru/pify?keyword=combining+like+terms+with+negative+coefficients+worksheet, suggesting a lure to disguise malicious activity. The presence of a large number of PDF links, many pointing to Shopify domains with numeric slugs, indicates a link farm designed to obscure the true malicious destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=combining+like+terms+with+negative+coefficients+worksheet
    • http://gudevimak.mixelle91.com/uploads/1/3/0/7/130775997/tujakebot-fotemimi.pdf
    • http://files.constructionprogress.org/uploads/1/3/1/4/131453539/45b41db9366aa8.pdf
    • http://files.mongomuscleapparel.com/uploads/1/3/1/8/131856723/divaremev-putuka-nodif-voriwaposa.pdf
    • http://files.fidgetsltd.com/uploads/1/3/1/4/131438353/vokilupa-gikugugaju.pdf
    • http://files.ibyouth.org.uk/uploads/1/3/0/8/130873804/mipivir-loweparuxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/18828941837.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/chromatic_harmonica_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/52232616974.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/gokinevos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/43355131756.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/40458759860.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/87255365966.pdf
    • https://cdn.shopify.com/s/files/1/0433/6952/9509/files/juwosetolonob.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/74497053098.pdf
    • https://cdn.shopify.com/s/files/1/0435/5522/5763/files/anthem_anywhere_mobile_app.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c0.bin
4491f2d3c501752a2533bc937c31690d5635c14624d78962a1bde482244cd87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C0 5556 bytes
font_01_sfnt_off00007395.bin
54c5363b2697f64174dabcfb86ae96a42adae5c538d5dfd91d38ed76a7c0a153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7395 10404 bytes

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